Epsilon : 3e-13
FEEngine [
 + id                : my_fem
 + element dimension : 2
 + mesh [
  Mesh [
   + id                : mesh
   + spatial dimension : 2
   + nodes [
    Array<double> [
     + id             : mesh:coordinates
     + size           : 9
     + nb_component   : 2
     + allocated size : 2000
     + memory size    : 31.25KiByte
     + values         : {{0, 0}, {1, 0}, {1, 1}, {0, 1}, {0.5, 0}, {1, 0.5}, {0.5, 1}, {0, 0.5}, {0.5, 0.5}}
    ]
   + connectivities [
    ElementTypeMapArray<unsigned int> [
        (not_ghost:_point_1) [
       Array<unsigned int> [
        + id             : mesh:connectivities:_point_1
        + size           : 4
        + nb_component   : 1
        + allocated size : 2000
        + memory size    : 7.81KiByte
        + values         : {{0}, {1}, {2}, {3}}
       ]
         ]
        (not_ghost:_segment_2) [
       Array<unsigned int> [
        + id             : mesh:connectivities:_segment_2
        + size           : 8
        + nb_component   : 2
        + allocated size : 2000
        + memory size    : 15.62KiByte
        + values         : {{0, 4}, {4, 1}, {1, 5}, {5, 2}, {2, 6}, {6, 3}, {3, 7}, {7, 0}}
       ]
         ]
        (not_ghost:_quadrangle_4) [
       Array<unsigned int> [
        + id             : mesh:connectivities:_quadrangle_4
        + size           : 4
        + nb_component   : 4
        + allocated size : 2000
        + memory size    : 31.25KiByte
        + values         : {{2, 6, 8, 5}, {5, 8, 4, 1}, {6, 3, 7, 8}, {8, 7, 0, 4}}
       ]
         ]
    ]
   ]
   GroupManager [
   ]
  ]
 ]
]